/// <summary>
 /// Click to add new user
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void newUser_Click(object sender, RoutedEventArgs e)
 {
     addNewUser newUser = new addNewUser();
     if(newUser.ShowDialog() == true)
     {
         FolderMenu folderMenu = new FolderMenu(User.users[User.users.Count-1],this);
         leftMenu.Children.Add(folderMenu);
         MailDatabaseHandler mdh = new MailDatabaseHandler(User.users[User.users.Count-1], true);
         mdhList.Add(mdh);
     }
 }
        /// <summary>
        /// Click to add new user
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void newUser_Click(object sender, RoutedEventArgs e)
        {
            addNewUser newUser = new addNewUser();

            if (newUser.ShowDialog() == true)
            {
                FolderMenu folderMenu = new FolderMenu(User.users[User.users.Count - 1], this);
                leftMenu.Children.Add(folderMenu);
                MailDatabaseHandler mdh = new MailDatabaseHandler(User.users[User.users.Count - 1], true);
                mdhList.Add(mdh);
            }
        }